(B1)
by accident
by mistake
(B2)
in order to celebrate or show great respect for someone or something
in honour of someone/something
(idiom) (C1) from the beginning, without using anything that already exists
from scratch
(collocation)
doing something connected with your job
on business
(collocation)
to experience something unpleasant, especially an illness, pain, or a serious problem over a period of time
suffer from
If something, especially a style of clothes, hair, make-up, etc. is ____ (collocation), it is no longer popular
out of fashion
(collocation)
in a way that is pleasant or interesting because it is different from what usually happens
for a change
(B1) (collocation)
to change words or text from one language into another language
translate … from … into …
(collocation) used to show that what you are saying is your personal view or judgment
in my opinion
(phrase) to surprise someone
take someone by surprise (phrase) (also take someone unawares)
(B2)
to think that something is true, especially when it is not
be under the impression
(phrase) (B2) If something is said ____, it is said in a very short form, with very few details
in brief
(phrasal verb) (B2) to meet someone you know when you are not expecting to
run into someone
(phrase) (C1) increasing
on the increase
(phrase) at the scheduled or expected time; not early or late
on time
(C1) to know or say something without doubt
know/say for certain