on somebody's part

on (someone's) part

1. As far as is related to, regards, or concerns someone; to the degree that someone is involved or a part (of something). On the employees' part, the company's merger means that many will be losing their jobs. Jane on her part has been instrumental in getting this project off the ground.
2. As comes from or is done by someone. Guarantees on the banks' part must be provided to assure the country's citizens that their money is safe during this period of recovery. There has been no shortage of effort on his part to make sure this campaign has been successful.
See also: on, part

on somebody’s part


on the part of somebody

(of an action) done, made or performed by somebody: The argument started because of an angry remark on his part.If you want to go camping, son, there’d be no objection on our part.
See also: on, part
References in classic literature ?
Behind that pain I was conscious there was a desire on somebody's part to explain something on which some tremendously important issue hung.