In Sanskrit Hanu means Jaw and man means disfigured so Hanuman means
disfigured jaw. No wonder, Hanuman’s jaw as a kid was disfigured by
none other than Lord Indra who had used his vajra (Thunderbolt)
against Anjaneya, who took sun as a riped mango and even went to trace
it up in the sky.
It was here in the sky that Lord Indra had used his
vajra which threw Anjaneya straight on the earth damaging his jaw