It's used as a classifier, like this:
"亢龙有悔"是"降龙十八掌"中的*一招*.
and
*一招一式*他都记得清清楚楚.
So how to say it in English?
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Sign up to join this communityGenerally it's called 'move'.
To be precise, 招 is 'move' and 式 is 'stance' or 'form'.
When it comes to a specific move, you can use words like catch (手 as in 擒拿手), hit (打), reach (长拳), kick (踢) etc.
一招一式他都记得清清楚楚。
Every move is imprinted on his mind.