blood is thicker than (something)

family relationships are stronger and more important than something else.

We were old friends, but I couldn't side with her against my parents — blood was thicker than friendship to me.

Etymology: based on the saying blood is thicker than water (= family relationships are strongest of all)

• a belly laugh
• a Bible-basher
• abide by
• abide by something
• a big ask
• a big cheese
• 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