hi,
try Cambridge Online Dictionary, under Idiom section. For that, you should follow the link:
http://dictionary.cambridge.org/defi...8840&dict=CALD
"get into stride" is chiefly Br.En and reffers to a situation in which you become more confident in what you do, usually at the start of a new job or so.
After a month or so, I am getting into the other's trainees strides.
Srdjan



