call, call out to, invite
呼 centers on using the voice to get someone's attention: calling out, summoning, or inviting someone to come.
呼 combines 口 (mouth) with 乎, which likely contributes the sound and originally depicted breath or an exclamation. Together they express calling out with the mouth.
The mouth 口 on the left and the breath-like shape 乎 on the right suggest using your mouth to call out: 呼 means to call or invite.
For コ, imagine calling out to a friend named Ko: 'Ko! Come here!' The sound 'Ko' cues コ while you call out with your mouth.
ah!; oh!; alas!
to call out (to); to call; to invoke
breathing; respiration
call; appeal
call; summons; paging; curtain call
call; invitation
name; designation; denomination; naming; giving a name
calling (someone a thief, coward, etc.); branding (as); denouncing
popular name; common name; given name
calling repeatedly (e.g. someone's name)
to call (someone) to (the door, phone, etc.); to tell (someone) to come; to call up (on the phone); to summon; to page; to invoke (e.g. a spirit)
deep breath
to call out to; to hail; to address
addressing (someone) without using a suffix such as "-san" or "-chan" (considered impolite)
hailing each other
to call in; to invite; to bring in
to call; to summon; to send for; to call together
roll-call; muster
barker; tout; hawker; someone who attempts to attract patrons to entertainment events, shops, bars, and such, by exhorting passing public
call; hail; yell