1. (

• stumble ,
• trip

) miss a step and fall or nearly fall; "She stumbled over the tree root" ;

2. (

• trip ,
• trip_up

) cause to stumble; "The questions on the test tripped him up" ;

3. (

• travel ,
• trip ,
• jaunt

) make a trip for pleasure ;

4. (

• trip ,
• actuate ,
• trigger ,
• activate ,
• set_off ,
• spark_off ,
• spark ,
• trigger_off ,
• touch_off

) put in motion or move to act; "trigger a reaction"; "actuate the circuits" ;

5. (

• trip ,
• trip_out ,
• turn_on ,
• get_off

) get high, stoned, or drugged; "He trips every weekend" ;