What is the meaning of هم?

they (masculine plural subject pronoun)

them, their (masculine plural bound object pronoun)

to disquiet, to make uneasy, to distress

to grieve

to preoccupy, to concern, to affect

to be of interest

to plan, to be about to, to start doing, to become determined [with بِ (bi)]

verbal noun of هَمَّ (hamma) 

anxiety, concern, worry, care

sorrow, grief, affliction, distress

weight, moment, importance

decrepit, senile

old man

they

them, their

anxiety, concern, worry, care

sorrow, grief, affliction, distress

still, all the same

both... and...

both... and...

they (third-person plural subject pronoun)

Enclitic form of هم (homme)

they, them, their

to concern, to preoccupy

them, their

also, too; either, neither

even; often with حتی (hatta)

both

Used in the non-initial clause to suggest a contrast.

each other; short for همدیگر (hamdigar)

grief; sorrow

Source: wiktionary.org