WordNet (r) 3.0 (2006):

run into
    v 1: be beset by; "The project ran into numerous financial
         difficulties" [syn: run into, encounter]
    2: collide violently with an obstacle; "I ran into the telephone
       pole" [syn: run into, bump into, jar against, butt
       against, knock against]
    3: hit against; come into sudden contact with; "The car hit a
       tree"; "He struck the table with his elbow" [syn: hit,
       strike, impinge on, run into, collide with] [ant:
       miss]
    4: come together; "I'll probably see you at the meeting"; "How
       nice to see you again!" [syn: meet, run into,
       encounter, run across, come across, see]

Moby Thesaurus II by Grady Ward, 1.0:

114 Moby Thesaurus words for "run into":
   add up to, afford, aggregate, aggregate to, alight upon,
   alter into, amount to, bang, bang into, be converted into, become,
   blunder upon, bring, bring in, bump, bump into, cannon, carom,
   carom into, chance upon, change into, clash, collide, come across,
   come among, come into collision, come on, come round to, come to,
   come up against, come up to, come upon, comprise, concuss,
   confront, confront each other, contain, cost, crack up, crash,
   crash into, crump, crunch, dash into, discover serendipitously,
   encounter, evolve into, fall aboard, fall across, fall among,
   fall foul of, fall in with, fall into, fall upon, fetch, foul,
   happen upon, head into, hit, hit against, hit upon, hurt, hurtle,
   impinge, knock, knock against, lapse into, light upon, meet,
   meet head-on, meet up with, meet with, melt into, mount up to,
   number, open into, pass into, percuss, pitch upon, ram,
   reckon up to, ripen into, run across, run broadside on, run down,
   run in, run smack into, run to, run up against, run upon,
   sail into, sell for, set one back, settle into, shift into,
   sideswipe, slam into, smack into, smash, smash into, smash up,
   strike, strike against, stumble on, stumble upon, tot up to, total,
   total up to, tote up to, tumble on, turn into, turn to, unitize,
   whomp