• Provides the /in command for delayed execution. Also provides /slashin, in case of conflicts with other addons providing /in.
• Also provides the /int command for throttled actions, when you like to spam click macros but only want the action to happen once.

Emote "yourname rocks" in 1.5 seconds:
/in 1.5 /emote rocks

Use your Argent Crusader's Tabard to teleport, then put your other tabard back afterwards:
/equip Argent Crusader's Tabard
/use Argent Crusader's Tabard
/in 12 /equip Scryers Tabard

Spam click a macro to send a message in party chat, but you only want the message to appear once:
/int 5 /p Here we go

• /say and /yell can only be automated in dungeons/raids, not outdoors. Use /emote when outdoors.
• Many types of commands can't be delayed, especially ones that cast spells. If you receive an error dialog saying "Interface action failed because of an AddOn" then that command can't be delayed.

https://www.curseforge.com/wow/addons/slash-in