recommend
One C, two Ms. The opposite of what everyone guesses.
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Wrong: reccomend
Right: recommend
It’s re + commend. One C, two Ms.
The trick
It’s re + commend. Commend has one C and two Ms, and adding the prefix changes nothing.
Splitting it at the prefix works for a lot of these: dis + appear, un + necessary, mis + spell. Find the real word inside and the doubling sorts itself out.
Now go find the commend inside it.