live (from) hand to mouth

to have just enough money to live on and nothing extra.

My father earned very little and there were four of us kids so we lived from hand to mouth.

• a big deal
• a big fish
• a big fish in a small pond
• a big girl's blouse
• a big gun
• a big-head
• a big-mouth
• a big mouth
• a big noise
• a big shot
• a big wheel
• a billet-doux
• a bird-brain
• a bird in the hand
• a bird in the hand is worth two in the bush.
• a bird's eye view
• a bite of the cherry
• a bite to eat
• a bit much
• a bit of all right
• a bit of fluff
• a bit of how's your father
• a bit of rough
• a bit of skirt
• a bit on the side