Ex·pa·ti·ate v. i. [imp. & p. p. Expatiated p. pr. & vb. n. Expariating ]
1. To range at large, or without restraint.
Bids his free soul expatiate in the skies. --Pope.
2. To enlarge in discourse or writing; to be copious in argument or discussion; to descant.
He expatiated on the inconveniences of trade. --Addison.