inform on (?.)

• accuse
• allege
• arraign
• article
• babble
• be indiscreet
• be unguarded
• bear witness against
• betray
• betray a confidence
• blab
• blabber
• blow the whistle
• blurt
• blurt out
• book
• bring accusation
• bring charges
• bring to book
• charge
• cite
• complain
• denounce
• denunciate
• double-cross
• fasten on
• fasten upon
• finger
• fink
• give away
• hang something on
• impeach
• imply
• impute
• indict
• inform
• inform against
• insinuate
• lay charges
• leak
• let down
• let drop
• let fall
• let slip
• lodge a complaint
• lodge a plaint
• narc
• peach
• pin on
• prefer charges
• press charges
• put on report
• rat
• report
• reproach
• reveal a secret
• sell out
• sing
• snitch
• snitch on
• spill
• spill the beans
• squeal
• stool
• take to task
• talk
• task
• tattle
• tattle on
• taunt with
• tax
• tell on
• tell secrets
• tell tales
• testify against
• turn in
• turn informer
• twit
• two-time