casualty - a person who suffers after sth bad, deploy - use sth effectively, disruption - a situation which is difficult , mess, infamous - famous for being bad, innocuous - not harmful, outage - power cut, be grounded - not being able to move/ take off, tech-savvy - sb with great knowledge of modern tech, reboot - restart, backlog - work that should have been done, glitch - fault, complimentary - for free, grievances - complaints, frustrating - annoying, till - machine used in shops to keep money,

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