Talk:smile

Chambers 1908 points out that a smile can also express slight contempt or disdain. Equinox ◑ 16:56, 15 October 2018 (UTC)

all smiles vs smile: pleasant appearance (often used in the plural)

an appearance of pleasure or approval (often used in the plural) 
They were all smiles when we left.
Microsoft® Encarta® 2009

--Backinstadiums (talk) 16:43, 15 January 2020 (UTC)

smile on

Random House Learner's Dictionary of American English and Collins Concise English Dictionary specify the preposition ON for such a meaning

[~ + on + object] to look at someone with favor
Luck smiled on us that night.

--Backinstadiums (talk) 16:47, 15 January 2020 (UTC)