is 'wander off' a valid English phrase?

i see the meaning of 'wander away' is 'to go off course'. do 'wander away' and 'wander off' mean the same thing? if not, what is the meaning of 'wander off'?
Yes and yes.
According to Google's hit-count, "off" is used about ten times as often as "away".
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thanks a lot Mister Micawber and Philip. I don't rely on google that much though, because most people - while writing on the internet - don't check their grammer (i too find it unnecessary). i asked the question because i've found 'wander away' in m-w but not 'wander off'.
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