Wiktionary
lose his head
vb. (alternative form of lose one's head English)
Usage examples of "lose his head".
If I leave one man quite alone, if I don't touch him and don't worry him, but let him know or at least suspect every moment that I know all about it and am watching him day and night, and if he is in continual suspicion and terror, he'll be bound to lose his head.
Boyd was a good fighter, by all accounts, in that he tended to lose his head and become a whirlwind, all arms and atti.
Even for the fraction of a second, there was absolutely nothing that could cause this man to lose his head or his nerve.
That was unfortunate, for he was all too likely to lose his head if it held.
He did not lose his head: long familiarity with danger had taught him to keep it, in any and all emergencies.