different between onlap vs unlap

English

on +? lap

onlap (plural onlaps)

(geology) The phenomenon of successively younger rock strata extending progressively further across an erosion surface cut in older rocks.

onlap (third-person singular simple present onlaps, present participle onlapping, simple past and past participle onlapped)

un- +? lap

unlap (third-person singular simple present unlaps, present participle unlapping, simple past and past participle unlapped)

(obsolete) To unfold.
(Can we find and add a quotation of Wyclif to this entry?)
(intransitive, usually reflexive) To overtake the leader in a race in order to no longer be lapped (one or more complete laps behind the leader).

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