Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
chicken [ˈtʃɪkɪn] n (bird, meat) ку́рица; (inf)(coward) труси́шка m/f
chicken out vi (inf)тру́сить*(стру́сить*perf)
he chickened out of going он стру́сил и не пошёл
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.