yorisou
1.

To position oneself closely beside another person, often implying a sense of comfort and intimacy in physical proximity.

2.

To draw near to someone in a way that suggests affection or tenderness, creating a sense of warmth and connection.

3.

To cuddle or snuggle with someone, indicating a desire for closeness and emotional bonding through physical touch.

Example:

彼女は夫のそばにぴったり寄り添っていた。

tsukisouつきそ付添tsukisou
1.

To remain close to someone in order to provide care or assistance, often in a supportive role.

2.

To stay by someone's side, particularly for the purpose of offering help or reassurance during challenging situations.

3.

To act as a companion or protector, ensuring the safety and well-being of another person, especially in situations where they require guidance or support.

Example:

彼は叔母に付き添われていた。

tsuresou
1.

To engage in a committed partnership characterized by mutual support and companionship, often associated with marriage or similar long-term relationships.

2.

To live together as a couple, sharing life experiences and responsibilities in a domestic setting.

3.

To form a lifelong bond with someone, often recognized through societal or legal means as husband and wife.

sou
1.

To stay close to or follow along with something, ensuring proximity or adherence, often implying a supportive or accompanying presence.

2.

To align oneself with certain expectations or guidelines, fulfilling what is desired or necessary for a particular situation.

3.

To engage in a close relationship, indicating intimacy or companionship, particularly in the context of marriage or partnership.

4.

To add a new element to an existing situation, enriching or enhancing it in some way, thereby contributing additional qualities or depth.