To pledge (something) as surety for a loan; to pawn, mortgage.
To designate in advance the specific purpose of expenditure for government revenues (especially taxes).
To designate a new tax or tax increase for a specific expenditure.
To imagine; to believe; to receive as true.
To require to exist or to be true; to imply by the laws of thought or of nature.
To put by fraud in the place of another.
To theorize or hypothesize.
To take for granted; to conclude, with less than absolute supporting data; to believe.