Word-level zoom

Read this sentence: "The teacher's smile thinned."

In ONE paragraph, analyse the effect of the verb "thinned" in the context of a tense classroom scene. [4 marks]

Indicative top-band paragraph:

The verb "thinned" is doing a lot of work in a tiny space. Smiles, in standard usage, "fade" or "fall" — but the writer's choice of "thinned" gives the smile a physical mass that is being stretched, drained or rationed. This implies the teacher is consciously controlling her expression rather than reacting honestly, a mask under strain. The single-syllable verb's clipped sound also mimics the teacher's effort: she is conserving everything, including her warmth. In a classroom scene already loaded with tension, that one verb signals to the reader that something has gone wrong without the writer needing to say it explicitly.

Mark scheme cues: unusual collocation, connotation of "thinning" as rationing/effort, sound effect of clipped monosyllable, inference about character's restraint.