In this image, German Chancellor Angela Merkel and European Council President Donald Tusk (his left side to camera) are shown speaking with President Trump at the 2017 G7 Summit.
Note the configuration of Donald Trump's mouth and lips. This is a variation of a "Lip Purse", and more specifically, a "Forward Lip Purse".
A forward lip purse is a very common (and rarely understood) nonverbal display. It signals disagreement. To nuance this further - this particular flavor of disagreement is not always fully verbalized, in fact, a portion or even all of it is frequently kept secret. Thus when you see a forward lip purse, the accompanying spoken words are often misleading or deliberately deceptive. Therefore this particular nonverbal sign is also indicative of a clandestine plan.
Summary: When you see a forward lip purse, you should have a strong suspicion of deception. Do not trust the person's words - for they are planning, but not sharing. Protect your flank.
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