tol

The root tol goes all the way back to the Proto-Indo-European root telh₂-, which carried a single physical image: "to lift up" and, by extension, "to bear the weight of something." Anyone who has carried a heavy load knows these two ideas are really one — to lift something is already to endure its weight. From this one image, Latin grew two related verbs, and English inherited two branches.

The first branch comes from Latin tolerāre, "to bear, to endure, to sustain." Here the focus is on holding up under a burden — not the lifting, but the enduring. This gives us the everyday family:

- tolerate — to bear something without breaking or complaining: tolerate pain, tolerate noise, tolerate a difficult person.
- tolerance — the capacity to bear. The word splits into several registers. In daily life it means acceptance of beliefs or behaviors you dislike (religious tolerance, zero tolerance). In medicine and biology it is how much your body can endure before harm (a tolerance for alcohol, drug tolerance). In engineering it becomes a precise number — the amount of variation a part is allowed to "endure" and still be acceptable (a tolerance of 0.01 mm). All three are the same idea: how much can be borne.
- tolerant — describing someone or something that bears well: a tolerant teacher, a drought-tolerant plant that endures dry conditions.
- tolerable — able to be borne, and so, by a quiet downgrade, merely acceptable: the food was tolerable. What you can just barely put up with is rarely excellent.

The second branch comes from Latin tollere, "to lift, to raise up" — the original "lift" sense kept literal. Add the prefix ex- (up, out) and you get extollere, "to lift on high." When you raise something up where everyone can see it, you are praising it — hence extol, to praise highly, to glorify. The burden has become a trophy held overhead.

There is also the English word toll (a fee for passing, or the slow ringing of a bell). The "fee" sense is partly tangled with this same family of "lifting / taking up" — a toll is what is taken up from a traveler — though its history runs through Old English and is not a clean derivation. Treat it as a distant, blurry cousin rather than a textbook member.

The pattern to remember: telh₂- meant "lift = bear." Latin split it into tollere (keep lifting → extol = praise) and tolerāre (keep bearing → tolerate, tolerance, tolerant, tolerable). Whenever you meet a tol- word, ask: is this about holding up a weight (endure) or holding something up high (praise)?