cave in (to (someone/something))

to agree to something after originally opposing it.

If the pressure from your parents becomes too strong, you might cave in and go to graduate school.

Etymology: based on the literal meaning of cave in (= to suddenly fall inward)

• lighten your load
• light fire
• Lightning does not strike twice.
• lightning rod
• light relief
• lights are on but nobody's home.
• lights are on but no-one's home.
• light up
• light up something
• light up somewhere
• light your fire
• like a bat out of hell
• like a blue-arsed fly
• like a bolt from the blue
• like a breath of fresh air
• like a bull at a gate
• like a bump on a log
• like a dose of salts
• like a dream
• like a headless chicken
• like a lamb
• like a lamb to the slaughter
• like a lost soul
• like a man possessed
• like a million dollars