aplacar

v. appease, placate, satisfy

v. appease, placate, mollify, propitiate

= abate, keep + the edge off + Algo, defuse, still, appease.
Ex: As the sobbing abated, the secretary's voice regained some steadiness.
Ex: 'I can certainly understand your concern,' she ventured, speaking with a certain amiable casualness which she hoped would keep the edge off his annoyance, 'but we're really trying to protect the taxpayer's investment and the library's materials'.
Ex: This article gives examples of how problem behaviour can be defused in a library.
Ex: And arming himself with patience and piety he tarried awhile until the hubbub was stilled.
Ex: They've been working their butts off since the program was launched to appease the crowd.
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* aplacar la ansiedad = allay + anxiety.