de·sist 
(dĭ-sĭst, -zĭst)
(dĭ-sĭst, -zĭst)intr.v. de·sist·ed, de·sist·ing, de·sists
To cease doing something. See Synonyms at stop.
[Middle English desisten, from Old French desister, from Latin dēsistere : dē-, de- + sistere, to bring to a standstill; see stā- in the Appendix of Indo-European roots.]