phrasal_verb | meaning
------------------------
black out    | faint
calm down    | become more relaxed
get off      | leave
get off      | remove
hold on      | wait
hold on      | grip tightly

def tokenize_meaning(sentence: str) -> list:
    """
    Splits the string in the meaning column into a list of possible phrasal verbs.
    :param sentence: str from the meaning column
    :return: list of strings
    """
    meanings = re.split('d.s+', sentence)
    meanings = flatten([re.split(', ', meaning) for meaning in meanings])
    meanings = [meaning for meaning in meanings if meaning[:3] == 'To ']
    meanings = flatten([re.split(' or ', meaning) for meaning in meanings])
    meanings = [meaning for meaning in meanings if not meaning == '']
    meanings = [re.sub('[(|/].*', '', meaning) for meaning in meanings]
    meanings = [re.sub('[.,?!]', '', meaning) for meaning in meanings]
    meanings = [re.sub('To ', '', meaning) for meaning in meanings]
    meanings = [meaning.strip() for meaning in meanings]

    return meanings