re·frain 1 
(rĭ-frān)
(rĭ-frān)intr.v.
To hold oneself back; forbear from doing something: refrained from swearing.
[Middle English refreinen, from Old French refrener, to restrain, from Latin refrēnāre : re-, re- + frēnāre, to restrain (from frēnum, bridle, from frendere, to grind; see ghrendh- in the Appendix of Indo-European roots).]
re·frainer n.
re·frainment n.