KNOCK (YOUR) HEAD OFF ON

make a considerable effort on; apply (oneself) energetically (to the point of exhaustion) to. A variation of knock oneself out. —Academy Level III Glossary

make a considerable effort on; apply (oneself) energetically (to the point of exhaustion) to. A variation of knock oneself out. Theyre the ones that you can just take and knock your head off on. -R2H Assessment (8 Aug. 63) make a considerable effort on; apply (oneself) energetically (to the point of exhaustion) to. A variation of knock oneself out.