blow the whistle (?.)

• arrest
• bear witness against
• betray
• blab
• block
• brake
• bring to
• bring up short
• call a halt
• check
• checkmate
• cut short
• dam
• deadlock
• draw rein
• fink
• freeze
• halt
• have had it
• inform against
• inform on
• lose patience
• narc
• peach
• pull up
• put paid to
• rat
• sell out
• snitch
• snitch on
• squeal
• stalemate
• stall
• stay
• stem
• stem the tide
• stool
• stop
• stop cold
• stop dead
• stop short
• tattle
• tell on
• testify against
• turn informer