tacher AND tâcher

tacher /taʃe/ (conjugate⇒)

1. transitive verb
   1. [substance] to stain;
      [person] to get a stain on [garment];
   2. to tarnish, to stain [reputation].

2. intransitive verb to stain;
   ça ne tache pas it doesn't stain.

Pocket Oxford-Hachette French Dictionary © 2005 Oxford University Press:

tâcher /tɑʃe/ (conjugate⇒) verb+preposition ~ de faire to try to do.