• to screw one's face into a smile
• to save face, to save one's face
• artificial, constrained, enforced, far-fetched, farfetched, feigned, forced, laboured, overwrought, strained, unnatural
• forced smile, stagy smile
• to laugh on the wrong side of the mouth
• to set one's wits to work to
• to press on, to press upon
• against the collar, exacting, stiff, trying