‘He’s not that much better’ (not that much + COMPARATIVE)

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Point 78 in ADJECTIVES/comparatives is defined as:

‘not that much’ to modify comparative adjectives to a small degree

in iWeb:

1 NOT THAT MUCH BETTER 280
2 NOT THAT MUCH BIGGER 109

It’s just not that much bigger.

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(listen to a similar sentence)

3 NOT THAT MUCH HIGHER 98