prolong, stretching
延 centers on making something longer in time or space: prolonging, stretching out, or extending. The idea applies to both physical stretching and extending deadlines or durations.
延 combines 廴 (a step or movement) with a component derived from 止 (foot), suggesting the idea of moving forward and extending. The modern form keeps the 廴 enclosure and a simplified inner shape.
The 廴 enclosure looks like a long stretching path, and the inner part resembles a foot (止) taking a step forward. Together they show a step that prolongs the journey.
For エン, imagine stretching a rubber band until it makes a long 'en' sound: en -> エン, and the band extends further and further.
extension; elongation; prolongation; lengthening
postponement; deferment; adjournment
delay; latency
futures
spread (e.g. of a disease); rampancy; infestation; proliferation; being widespread
keeping alive longer; prolonging life; life extension; life-support
by extension; in turn; by the same token; in addition; as well; consequently
to survive; to live long
stretching; extension; elongation
to become overgrown; to grow thick
arrears; (being) overdue; delay (e.g. in payment); procrastination
spread of fire
postponement; moving to a later date
taking a long time; slowness; sluggishness
Engi era (901.7.15-923.4.11)
medulla oblongata
rolling; extending by applying pressure
postponement
endlessly; continuously; (going) on and on
Man'en era (1860.3.18-1861.2.19)