raise my hand

1. When you think you know what should be done/take the lead in a situation or when you think that you can make the right decision.
2. When you want to vote on something.

Examples for "raise my hand"
1. -Who wants to go inside first?

-I'm raising my hand!
2. -Who did you vote for, Mark?

-I raised my hand for Trump.

plus-half

Something that is one and a half units of measurement (meters, hours etc.). It always goes with the unit of measurement, which can only be in the singular.

Example for "plus-half"
-When is our ship leaving?
-In a plus-half hour (one and a half hours).

pick up word

To get information about something, either by a certain messenger or by rumor.

Example for "pick up word"
I picked up word that Jenny and Chris started dating again.

knock on heaven's door

When you risk your life and almost get yourself killed.

Example for "knock on heaven's door"
-Why are you always risking your life? I don't want you to be a hero if it kills you! Do you know how much I worry about you? And still, you just keep knocking on heaven's door!
-I'm sorry mom, but I couldn't let that baby burn alive inside that building when it was on fire. And the mother was screaming outside.