mask

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mask something out

to conceal or cover part of something from view. The trees masked the city dump out, so it could not be seen from the street. The trees masked out the dump.
See also: mask, out

somebody's mask slips

if someone's mask slips, they do something which shows people their real personality, when they have been pretending to be a different, usually nicer, type of person
Usage notes: A mask is something that covers your face to hide it.
His mask had suddenly slipped, and she saw him as the angry and cruel man that he really was.
See also: mask, slip
References in periodicals archive ?
System control functionality includes an IRQ interface, general purpose I/O pins, fan control with two tachometers and independently programmable pulse width modulators, maskable hardware wake-up events, and a System Management Bus (SMBus) interface.
The CoreAI offers ADC conversion controlled by CoreMP7 and an APB slave interface with 8- or 16-bit width and 14 maskable interrupt sources.
System control functionality includes an IRQ interface and ACPI embedded controller interface, general purpose I/O pins, fan control with two tachometers and independently programmable pulse width modulators, maskable hardware wake-up events, and a System Management Bus (SMBus) interface.
The LPC47S45x also includes system control functionality such as parallel to serial IRQ conversion circuitry, an X-Bus interface for System Management Controller, general purpose I/O pins, and maskable hardware wake-up events.
Other features include an embedded CDR unit that is compliant with SONET/SDH jitter requirements, plus alarm indicators, status monitoring and error counters, all using maskable interrupts for each of the status indications.