the.com/surcharge

A fee for the privilege of paying a fee.

means An extra charge added on top of the normal price, usually tacked on for some special circumstance like a card payment, fuel, or holiday peak.

from Built from the prefix 'sur-' (over, above, from French sur, ultimately Latin super) plus 'charge' (to load, burden — from Old French charger, tracing back to Latin carricare, 'to load a cart'). So a surcharge is literally an 'overload' — an extra weight piled on top of the cart you already agreed to pull.

origin
from French sur plus charger, to overload
credit cards
many states cap or ban them entirely
airlines
mastered renaming fares as surcharges since 1990s
psychology
feels worse than an equal price hike
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