吃 eat; food; absorb
Examples:
1）eat; take
吃早饭 eat breakfast
吃奶 take milk from its mother
2）live off
吃父母 live off one’s parents
坐山吃山 live off the mountains wher your home is

Others:
1） 吃穿 food and clothing
讲究吃穿 be particular about one’s food and clothing
不愁吃穿 not have to worry about food and clothing
2) 吃喝玩乐 seek pleasure
for example:我们难道没有比吃喝玩乐更高的人生目标吗？
Can we have no higher aim in life than mere pleasure-seeking?

3) 吃亏 suffer losses
他吃了自私的亏。
He suffered from his own selfishness.