set (the) alarm bells ringing - if something sets alarm bells ringing, it makes you feel worried because it is a sign that there may be a problem.

Alarm bells started to ring (= I became worried) when I found out that he still lived with his mother.

• 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
• a bitter pill