Denshi Jisho — Online Japanese dictionary

止める とめる 1: to stop (something or someone); to turn off;
2: to concentrate on; to pay attention to;
3: to remember; to bear in mind;
4: to fix into place;
5: to park; to leave somewhere for a time
Common word, Ichidan verb, Transitive verb 
止める やめる 1: to stop; to cease; to end; to quit;
2: to cancel; to abandon; to give up; to abolish
Common word, Ichidan verb, Transitive verb 
止める とどめる 1: to stop; to stay (e.g. the night); to cease; to put an end to;
2: to contain; to keep (in position, in place); to limit;
3: to record (e.g. a fact); to retain
Ichidan verb, Transitive verb 

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