"If you can't beat them, join them" 成语 or 俗语 There is an English expression, "If you can't beat them, join them."  

For example,


  After competing with Microsoft for so many years, he finally accepted the lucrative offer and joined as their head of software development. You know what they say, "if you can't beat them, join them!"


Is there a 成语 or 俗语 to this effect?
The essence of  &quot;If you can't beat them, join them.&quot; is &quot;It is better to be  practical and join the winning side than being stubborn and stick to one's own position.&quot;
The example you gave for this idiom, describes &quot;識時務者為俊傑&quot; (Ones who understand situations and act accordingly, are the elites) very well.

所謂「識時務者為俊傑」，當對手強橫無比，而自己又一無所有時，唯有順應時勢，才不致因彼此對峙而有所耗損。
&quot;Ones who understand situations are elites&quot; means when the opponent is too strong to overcome, you can only conform to the situation to avoid meaningless lost&quot;