low key (adjphrase)
/loʊ ki/

helping you to rest and become less anxious

explosion (n)
/ɪkˈspləʊ.ʒən/ 

a large increase in the number of something that happens very quickly

if for no other reason (phrase)
/ɪf fɔr noʊ ˈʌðər ˈrizn/

if nothing else made you do something

hang out (phrasal verb)
/hæŋ aʊt/

to spend a lot of time in a place

take advantage of (phrase)
/teɪk ədˈvæntɪdʒ əv/

to make use of something well; to make use of an opportunity

chill out (phrasal verb)
/tʃɪl aʊt/

to relax and stop feeling angry or nervous about something

shuttle (adj)
/ˈʃʌt̮l/

a plane, bus, or train that travels regularly between two places

tickled pink (adj)
/ˈtɪkld pɪŋk/

very pleased or amused

time flies
/taɪm flaɪz/

time seems to pass very quickly

jet up (phrasal verb)
/dʒɛt ʌp/

to go somewhere

make my best effort (adj)
/meɪk maɪ bɛst ˈɛfərt/

to try very hard

time's escaped me (phrase)
/taɪmz ɪˈskeɪpt mi/

did not realize how late it had become

getting the first butterfliesout of his stomach (idiom)
/ˈɡɛt̮ɪŋ ðə fərst ˈbʌt̮ərˌflaɪz aʊt əv hɪz ˈstʌmək/

getting used to something for the first time

take care (phrase)
/teɪk kɛr/

used when saying goodbye

to let go (phrase)
/tu lɛt ɡoʊ/

to rest and do something enjoyable, especially after work or effort