If you allow someone to do something, it means that…
To slay means ‘to kill violently.’ These days, it is quite a literary term, but it is also used, especially in US English, as a synonym for murder, particularly in newspaper reports. Figuratively, it means ‘to destroy or extinguish.’ Informally, slay is used to mean ‘to impress strongly or to overwhelm, especially with something funny…
To swear means ‘to make a solemn declaration, statement, or promise.’ If you swear by something or someone, you are naming a sacred object or being a witness or you are saying you have great faith in something. To swear is also ‘to bind or make someone promise something by oath.’ As a legal term, it means…