הִכְנִיס רֹאשׁוֹ בְּקוֹלָר פָּנוּי

ביטוי (אנגלית)

To cause oneself unnecessary trouble/ to thrust one's head into an empty yoke

הגדרה (אנגלית)

By metaphor: to entangle oneself in troubles. One sees a distress and enters into it willingly (a yoke means a chain hung on the neck of a living creature).

("If you knew that a vow is like putting a collar on his neck... if she was passing by and saw an open collar and put her head inside it" - Yerushalmi Nedarim 9:1)