...as a brick.....or as thick as two short planks
Mathematical phrase is a number phrase which does not express a complete thought.
'Tooth and nail' is the complete phrase.
From is a preposition, but there is no object to complete a prepositional phrase.
An absolute phrase is a phrase that when you add the words Was or Were you can get a complete thought out sentence.
It means through all the good times and all the bad times. (thin referring to thin provisions and thin luck and thick referring to the opposite)
As thick as thieves
no,because not all phrase has not a complete thought.
of the people
Lisa wants to go quickly.
"of the mantle" is the prepositional phrase.