It generally seems to be used when someone is either praying or requesting something from, a god. However it is also used when someone has agreed to something and they are asked to hold to it.
mathematical phrase
No, an allusion is a phrase designed to call something to mind without actually mentioning that thing. An idiom is a phrase that makes no sense unless you know the idiomatic definition.
A "close call" can either be a difficult decision to make in which either decision seems to be as good of a choice as the other, or the phrase can mean something negative that almost happened.
The same as for "binary tree". Enter that phrase in Answer.com for the definition.
repeated phrase or motif
ygiutuyguhyj
It means not overpaid.
There isn't a specific definition for this phrase.
it's ur period love
An overused phrase, not original.
To receive a telephone call.
Itching Palm:Literal definition: To itch the hand of your ownSlang definition: To grope peopleSecond Slang definition: To masturbate uncontrollably