"Bhikkhu" (Pali) or "Bhikshu" (Sanskrit) literally means a mendicant, or one who lives off alms. But this doesn't mean they literally beg for food. However, they live off alms given to them.
ALMS FOOD
◊ As has been mentioned above, the Buddha said that there were four
necessities of life: clothing, food, shelter and medicine.
The Buddha suggested (fn73) that the basic source of food for bhikkhus
was that received on the morning alms round (pi.n.dapaata). This daily
dependence on alms food reminds both the bhikkhus and the lay devotees
of their interdependence and prevents the bhikkhu from becoming too
isolated from the lay community. He 'meets' them every day and eats
the food that they share with him. Several important rules are
concerned with this as well as a major section of the Sekhiya Training
rules. (See below; see also story about Ven. Assaji.)
An alms round is not considered begging, for the bhikkhu does not
solicit anything but is ready mindfully to receive any alms that lay
people may wish to give. Although alms food may sometimes be meager,
the bhikkhu is always expected to be grateful for whatever he is
given.(fn74) It is surprising how particular we can be about what food
we like to eat; and what complications that can cause. This is
reflected in the way rules concerning 'edibles' are arranged, which
may seem very complex especially when the bhikkhu's life is supposed
to be so simple. It should be borne in mind that the rules often deal
with extraordinary circumstances and try to prevent them from becoming
the norm.
Begging for Food
When the 'group-of-six' monks in the Buddha's time solicited 'special
foods' and ate them themselves, the lay people criticized this saying,
"Who isn't fond of good food and sweets?" The Buddha therefore laid
down this rule:
"There are these finer staple foods, i.e., ghee, fresh butter, oil,
honey, sugar/molasses, fish, meat, fresh milk, and curds. Should any
bhikkhu who is not ill, having asked for finer staple foods such as
these for his own sake, then eat them, it is [an offence of
Confession.]" (Paac. 39; BMC p.367)
"There are sumptuous foods, namely foods mixed with ghee, butter, oil,
honey, molasses, fish, meat, milk and curd; and a monk who, though not
sick, asks for such sumptuous foods for himself and eats them commits
[an offence of Confession.]" (Paac. 39; BBC p.127)
The ancient commentators suggest that these 'finer foods' are actually
made when one mixes rice, for example, with butter or fish, etc.
An exception is made for a monk who is ill, and a bhikkhu can ask for
special food for the sake of a fellow monk who is sick. (He is always
allowed to ask a relative or someone who has offered a Pavaara.naa
Invitation.
Receiving and Eating Food
A whole section (fn75) of the seventy-five Sekhiya Training guidelines is
concerned with how a bhikkhu receives and eats his alms food. Although
'table manners' may differ from country to country, and from age to
age, these Sekhiya rules still largely conform to what is considered
good manners:
"I will receive alms food appreciatively." (fn76) (Sekhiya 27)
"When receiving alms food, I will focus my attention on the bowl."
(Sekhiya 28)
◊ This explains why the bhikkhu may not look at the donor when
accepting food — he is concentrating on properly receiving it. "I will
receive/eat (bean-)curries in the right proportion to the rice."
(Sekhiya 29/34)
It is suggested that this was laid down so that bhikkhus on alms round
would not pass by people offering plain rice in favor of better
quality food. (See EV,I,p.211) "I will receive alms food only until it
reaches the rim of the bowl." (Sekhiya 30)
◊ However, on festival or special occasions the bhikkhu's bowl may be
emptied so that everyone who wants to join in offering has the
opportunity. (fn77) "I will eat alms food attentively." (Sekhiya 31)"When
eating alms food, I will look only into the bowl." (Sekhiya 32)
◊ This is also why the bhikkhu should not be expected to talk while he
is eating, for this will distract his attention. "I will not cover up
curries or other food with rice out of a desire to get more." (Sekhiya
36)
If donors think that the monk has only plain rice in his bowl, they
may give him some 'better' food. "When I am not sick, I will not ask
for curries or rice for my own benefit." (Sekhiya 37)
Other Sekhiya rules seem aimed at bhikkhus eating from their bowl
using their fingers in the traditional way of India: (fn78)
"I will not make up an overlarge mouthful of food; nor open my mouth
until the portion of food has been brought to it; nor put my fingers
into my mouth; nor speak with my mouth full.
"I will not eat: stuffing out my cheeks; shaking my hand about;
scattering grains of rice about; putting out my tongue; making a
champing sound; (or drink) making a sucking sound; licking my hands;
scraping the bowl; licking my lips. I will not take hold of a vessel
of water with my hand soiled with food." (Sekhiya Section; see End
Note 75.)