in default of (something)
Due to the absence or lack of something; through the failure of something. Though it was only a speeding ticket, Janet was imprisoned in default of paying the fine. In default of concrete evidence, the jury was obligated to acquit the defendant of murder.
in default of
Through the failure, absence, or lack of, as in In default of a better solution, we'll have to make do with this one. This term was originally put as for default of, but John Gower had the current wording in Confessio Amantis (1397): "The fish, if it be dry, might in default of water die." [Late 1200s]
in default of
Through the failure, absence, or lack of.