Englishtamper
verb
she saw youths tampering with her neighbor's car:
interfere, monkey around, meddle, tinker, fiddle (around), fool around, play around, toy, trifle, dabble;
do mischief to, doctor, alter, change, adjust, damage, do damage to, harm, deface, vandalize, ruin;
informal mess around;
British, informal muck about, muck around.