exchange, spare, substitute, per-
替 centers on swapping one thing for another: exchanging, substituting, or having a spare ready to take over.
替 is thought to combine 㚘 (two people side by side) with 曰 (to speak), suggesting a verbal exchange or substitution between two parties. The exact historical development is uncertain.
Two people (㚘) stand together and speak (曰) to arrange a swap: one person exchanges places or items with the other.
For タイ, imagine exchanging a tie with someone: tie -> タイ, and the two people swap neckties while speaking.
change; alteration
exchange; conversion; replacement; switching (to); switchover
to succeed; to relieve; to replace
changing clothes; change of clothes
substitution
money order; draft
replacement; substitution; change
changing every day
to change; to switch; to change over (to); to renew
transfer; switching over; change
to replace; to convert; to change
change; money exchange
stand-in; proxy; substitute; double; ringer
to change (one's clothes)
rearrangement (of classes); recomposition; recombination; reclassification
seasonal change of clothing; changing one's dress for the season
to repaint; to paint again; to paint (a different colour)
to exchange; to swap; to barter; to trade
to reorganize; to rearrange; to put (things) in order
exchange rate; rate of exchange
to pay for someone else (with the expectation of being reimbursed later); to lend someone the money to pay for (e.g. rent); to make a temporary payment on someone's behalf